I'm not an expert at this but I figured I would share what I have learned so far through all my searching here and XDA, not to mention a lot of trial & error from constant replacing tabs.
Here is a list of the manila files that are tied to the TF3D Tabs and Slider. Use Manila Editor to open and replace image/pic on the tabs. They use .png images and should be 64X64 for the ones in the tab (tray) and 128X128 for the ones on the screen (hero), but I have found out that you can use the 128X128 for both and it will work just fine. Make sure images have a clear background or you will see "it" (background) in the tab and it doesn't look that good. At least that's my opinion.
Home Tab:
4d06823d_manila & 776726f2_manila
Calendar Tab:
112dc2ce_manila & 1479c303_manila
Call History Tab:
4cd8f2e4_manila & 7b5fd72f_manila
Comm Manager Tab:
1e439536_manila & 42d367fd_manila
Internet Tab:
7fbd2c5d_manila & 03092c92_manila
Mailbox Tab: (Email)
6b46b991_manila & 59c727fc_manila
Music Tab:
0cfe494a_manila & 7b7eb7b5_manila
People Tab:
1d2cf08e_manila & 40b0d619_manila
Pictures and Videos Tab:
3c5a5c12_manila & 5fde419d_manila
Programs Tab:
40ebb8a7_manila & 48c215bc_manila
Settings Tab:
037c8fc5_manila & 06c88ffa_manila
Messages Tab: (SMS)
5780582c_manila & 5acc5861_manila
Stock Tab:
4bfbdbf8_manila & 174ba15d_manila
Weather Tab:
730f3c64_manila & 7a18fbb9_manila
Sound Profiles Tab:
6ce69b65_Manila & 1874ecda_manila
Slider:
1e29e8e7_manila
The manila file to edit order or add Tabs is:
26948339_manila
The manila file to edit the "Display Names" (for instance, if you want to see "Peeps" instead of "People" when hovering over the Tab with the slider) is:
090661f7_manila
When you are done editing there is no need for a Cab. Simply turn of TF3D and copy files to the "Windows" folder of your device, overwrite if prompted to, and turn on TF3D. No Restart is necessary.
*Edit* I've attached my compilation of Tabs in case anyone wants to try them or just not want to extract their own to change. Regardless of what you use them for, Good Luck!
**Edit**6-4-2009* I realized that I never attached screenshots for those who wondered what these looked like so I have added them. With the exception that I have since changed the home tab to a png of a Diamond and not the Windows Orb. I am not using all the tabs that I have changed the icons for but you should get the jist of what I am doing with these screenshots.
